1272118291 has 2 divisors, whose sum is σ = 1272118292. Its totient is φ = 1272118290.

The previous prime is 1272118271. The next prime is 1272118301. The reversal of 1272118291 is 1928112721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1272118291 - 2⁷ = 1272118163 is a prime.

It is not a weakly prime, because it can be changed into another prime (1272118271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636059145 + 636059146.

It is an arithmetic number, because the mean of its divisors is an integer number (636059146).

Almost surely, 2^1272118291 is an apocalyptic number.

1272118291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272118291 is an equidigital number, since it uses as much as digits as its factorization.

1272118291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 34.

The square root of 1272118291 is about 35666.7673191726. The cubic root of 1272118291 is about 1083.5338890440.

The spelling of 1272118291 in words is "one billion, two hundred seventy-two million, one hundred eighteen thousand, two hundred ninety-one".